Concrete former



Aug. 14,1928.

' r J. A. HINTZE CONCRETE FORMER Filed Sept. 15, 1927 (/47? A. /-//N7'Z INVENTOR A TTO/(NE Y Y UNITED STATES Patented Aug 14, 1928.

PATENT 1 OFFICE.

JAMES A. HINTZE, OF DAVENPORT, IOWA,

CONCRETE roamm.

Application filed September 15, 1927. Serial No. 219,638.

My present invention pertains to the forming of holes in concrete when the same is poured and more especially to the maintaining of the hole former in the desired position, and among the objects of my invention are to provide a new means for forming holes in concrete structures in any desired positions; toprovide means for holding the.

hole formers in desired positions; to provide a hole former which ma be either left closed or may be easily opene for the insertion of electric conduits, steam pipes and the like" and such further objects, advantages an capabilities as will hereafter appear and as are inherent in the construction disclosed. My invention further resides in the combi: nation, cqnstruction and arrangement of parts illustrated in the accompanying drawing and, while I have shown therein a preferred embodiment of m present invention, I desire it understood that certain changes in form, materials, etc., may be made without departing from the spirit of this invention.

Inthe drawing annexed hereto and forming a part hereof, Fig. 1 is an elevation of my invention, showing the same mounted upon a form board and ready to have concrete poured around the same and Fig. 2 is a vertical central section of the same construction.v 7

Referring more in detail to the annexed drawing, numeral 1 denotes a form board for retaining plastic concrete or the like, whether this board be horizontally, vertically, or otherwise fposit-ioned. In the present drawing this orm board is shown as being horizontally positioned, but the use of my invention in other positions will be illustrated by turning the drawing on its side or in otherjpositions. Numeral 2 denotes a cup or cap or other retainer secured to the form board by a nail or similar securing means 3. It will be understood that this cup is preferably placed in-position upon the form board and the nail driven in to hold the same in place, before the tube 4 is put capable of sliding therein for purposes of inches inlength as I believe that adjustment. It will of course be understood that the tubes 4 and 5 may be of any desired length or diameter, those shown being considered preferable for most purposes. While the tubes 5 ordinarily come in standard lengths, it is of course clear that these may be made in special lengths if desired; However, with my construction, this is not necessary as the tube. 5 may be adjusted the extent of an inch or more without destroying the efficiency of my support.

" Secured adjacent the end of tube 4, remote from cup 2, are braces6 which are held in place in any .desired manner as by means of rivets 7 or molten metal or both, if desired. I prefer to use both forms of fasten- 1ng in order that there may be no question as to the ability of braces 6 to hold the former in proper position. For many years it has been thecustom to fasten tubes corre sponding to tube 5 in place upon form boards and then have a man present throughout the pouring ofthe concrete to keep the tubes in positionso that the holes, when completed, will have the proper direction. The neces-' sity for the presence of thisman is that without any means to hold the tubes in proper alignment, the concrete, when poured, will push the tube one direction or another so that the completed hole will not have the proper direction. Accuraterecords kept on this work indicate that it costslabout $1.00 per hole to keep these tubes in proper aligir ment. If no'man is hired to do this work, while the concrete is being poured, it is common experience that the tubes are out of alignment and it is then necessary, after longitudinally with relation to the tube 4 to the concrete has hardened,to drill new holes the tubes in position or the necessity of drilling new holes in event the tubes get knocked out of position during the operation of pouring the concrete.

After the cup 2 has been fastened in 130- sition and pipe 4 placedtherein, this pipe is given the proper direction, so that the completed'hole will be precisely in the position desired. Nails 8, or other suitable fastening means, are then driven through the ends of braces 6 to hold the tubes in position against lateral strains. The device is then ready for use and will be found very effective for the purpose intended. In an extreme testwhich was made to determine the efiicieney of this device for the. purpose for which intended, a wheelbarrow load of bricks were dumped against one of these devices nailed upon the floorand, notwithstanding this test, the device remained exactly in position, though the tube 5 was somewhat scarred from bricks striking against it. 1

Though I have disclosed this construction in connection with its use in the formation of openings through concrete floors, it is to be understood that it may also be used in the formation of holes through walls and elsewhere. Also, I have used the term con crete* as meaning any plastic material used in the formation of floors, walls and the like and do not intend it to be interpreted to mean a specific mixture of sand, gravel and cement. F urthermore, the term, form board is. intended to cover such a' construction used for the purpose indicated, whether made of" wood or other material. hen a plurality of'holes are to be formed so closely adjacent each other that it is impossible to use the braces 6 on the adjoining sides, a portion of these braces may be cut away and the stub ends fastened together by rivets or otherwise so that the tubes will be placed at the proper distance; apart. This will secure the tubes to each other and, the remaining braces. will secure each of them to the form board. This will make a very effective method of bracing, notwithstanding removal of a portion of one or more braces. Any number of braces from three up may be used but it is considered that at least four should be provided for effectively holding the. tube in"upright position.

Another form of execution of thisinvention which is very effective is to splita rectangular sheet of metal throughout the greater portion of its length so 'as to have a number of adjacent strips 6 connected at one end by a band of sufiicient length to go around the tube 4 andoverlap somewhat at its ends. This can then be wrapped around the top of'the tube at and have one or. more rivets 7 passed therethroughto' secure the ends of the band together and to secure the band, to the tube 4; The bracing strips 7 can then be bent outwardly away from the tube 4, when it is desired to apply this tube to the cup 2. The ends of these stays would then be secured to the form board as indicated' above. In this constructionthe number ofthese strips would be dependent upon, the width thereof but it would probably be desirable to have at least 6of' these strips in. this form ofconstruc tion.

In lieu of setting the tube -linside of the cup or cap 2, the latter may be made of the same diameter as the tube 5 and tube it may then be set outside of this cup or cap. Also, in lieu of using a cup, a suitable block of proper size to fit inside of the tube 4 may be secured to the form board and then the tube may be set outside of this block as indicated above. There are both advantages and disadvantages in this form of construction and it will then depend upon the desires of the user whether the tube 4 is to be set inside or outside of the scouring means which is attached to the form board and holds the lower end of the tube at in position. Other suitable forms of retainer 2 are within the scope of my invention, such as angular pieces of metal having the corners bent up to hold the tube 4. in place. i

It is of course understood that the specific description of structure set forth above may be departed from without departing from the spirit of my invention asset forth in this specification and the appended claims.

Having now described my invention, I claim:

1. In a structure for the purpose indicated, a pair of telescopically adjustable tubes, a cap detachably covering an end thereof and adapted to be secured to a form board, and a plurality of bracing elements secured adjacent the end of the outer tube remote from the cap, extending diagonally away from the tube to the plane of the cap and adapted to besecured to the form board to prevent accidental mis-alinement of the tube.

2. A concrete former comprising a cup shaped member to be secured to a concrete form board, and a tube connected to the cup, and having braces secured thereto remote from the cup, said braces extending away from the tube a distance to be secured to the form board and brace the tube to keep it from being pushed out of position accidentally. I

3. A concrete former comprising a cup shaped member to be secured to a concrete form board, and a tube connected to the cup and having braces secured thereto remote from the cup, said braces extending away from the tube a distance to be secured to the form board and brace the tube'to keep it from being pushed out of position accidentally, and a tube slidably mounted in the first named tube to be adjusted longitudinally thereof.

4;. Stay mechanism for a plastic material former comprising a cup to be secured to a form board, a tube connected with said cup, and stay means associated with said tube and adapted to be secured to the form board at a distance from the cup at various points around the same.

5. A plastic material former comprising the form board at a distance from the locata locating means secured to a form board, ing means, at various points around the a tube to engage said locating means and same. n I 10 have an end positioned thereby, said tube In Witness whereof, I hereunto subscribe 5 being free from positive connection With said my name to this specification.

locating means, and stay means associated with said tube and adapted to be secured to JAMES A. HINTZE. 

